Only reason I joined was to find out what plants are easiest to grow and harvest in subtropical and tropical environments.

Acacia and Mimosa trees are some of the highest yielding, but would take years before reaching harvestable size and even then, isn't chopping up roots a real pain? Are the grasses an easier option? Climate is SE Asia. Any and all options are appreciated, Thanks!

Look into Acacia leaves

IMO don't put all your eggs in one basket. Grow all the plants you can, given your climate and available space. Find all the highest yielding Acacias (check this and this) and try to locate seed or live cutting suppliers, sow a bunch of seeds from each species because some will die along the way. A lot of these Acacias have DMT in their phyllodes/leaves, so you can harvest sustainably and you dont have to wait too many years to do it. And anyways, better start now, so in a few years you have almost unlimited sustainable supply.

Do the same for Mimosa hostilis, Diplopterys cabrerana, Psychotria viridis, Desmanthus illinoiensis, Desmanthus leptolobus, etc

Great info, you guys! Acacia and mimosa were always my long term plan as they are innocuous and common here, so it's good to know it's not just the roots I can harvest from. I'll look into those other plants as potential companion plants as well. Will need to find a niche in my little ecosystem. Thanks for the links too!

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This ^

Yes grow them all and find the one which does best for you. If you consider Psychotria viridis you might as well want to think about viridis hybrids which are said to grow easier and faster then "normal" ones.